[Under Ubuntu, conda fails to create an environment and reports an error: ProxyError: Conda cannot proceed due to an error in your proxy configuration

Problem report

Using conda to create an environment encountered an error: "ProxyError: Conda cannot proceed due to an error in your proxy configuration".
After trying many online methods, I feel that there is no solution that can cure all diseases. According to the online solution, the following experience is summarized for everyone Reference:
Try to switch to a domestic source first, if it is solved, it will be ok, skip the following article.
If it is not resolved, close the proxy.

solution

View the current terminal proxy:
delete, HTTPS, HTTP, http and other proxies in turn

unset http_proxy
unset https_proxy
unset no_proxy
unset HTTP_PROXY
unset HTTPS_PROXY
unset NO_PROXY

Finally, create the environment to succeed!